Port Alert
Charleston, SC
August 22, 2025
Notices
Hurricane Erin Advisory Number 44 - NWS National Hurricane Center Miami FL AL052025 - 500 AM AST Fri Aug 22 2025
...ERIN IN THE FIRST STAGES OF POST-TROPICAL TRANSITION......SWIMMING AT MANY U.S. EAST COAST BEACHES IS LIKELY TO REMAIN DANGEROUS FOR A COUPLE MORE DAYS...
SUMMARY OF 500 AM AST...0900 UTC...INFORMATION
----------------------------------------------
LOCATION...38.6N 65.3W
ABOUT 435 MI...700 KM N OF BERMUDA
ABOUT 425 MI...680 KM SSW OF HALIFAX NOVA SCOTIA
MAXIMUM SUSTAINED WINDS...90 MPH...150 KM/H
PRESENT MOVEMENT...NE OR 55 DEGREES AT 22 MPH...35 KM/H
MINIMUM CENTRAL PRESSURE...956 MB...28.23 INCHES
WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:
The Bermuda Weather Service has discontinued the Tropical Storm
Warning for Bermuda.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
There are no coastal watches or warnings in effect.
Interests in Atlantic Canada should monitor the progress of Erin and
refer to local forecasts issued by Environment Canada.
===========================================================
1. Near the Leeward Islands (AL90): Showers and thunderstorms are showing some signs of organization in association with a tropical wave located about a hundred miles east-northeast of the northern Leeward Islands. Environmental conditions appear conducive for further development of this system, and a tropical depression or tropical storm is very likely to form
this weekend while it moves northwestward and then northward, in
between the northern Leeward Islands and Bermuda.
* Formation chance through 48 hours...high...80 percent.
* Formation chance through 7 days...high...90 percent.
2. Central Tropical Atlantic (AL99): Showers and thunderstorms associated with a tropical wave located about midway between Africa and the Windward Islands have become less organized overnight. While there is still some chance that a short-lived tropical depression could form during the next day or so, the system is expected to move through a less conducive
environment into Saturday. The wave could reach a slightly more
favorable environment again late this weekend into early next week
as it moves westward at 10 to 15 mph over the central tropical
Atlantic and approaches the Lesser Antilles.
* Formation chance through 48 hours...medium...40 percent.
* Formation chance through 7 days...medium...50 percent.
3. Central Subtropical Atlantic: A small area of low pressure located well southwest of the Azores has weakened overnight, and no development is expected while it drifts northward.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...low...near 0 percent.
this weekend while it moves northwestward and then northward, in
between the northern Leeward Islands and Bermuda.
* Formation chance through 48 hours...high...80 percent.
* Formation chance through 7 days...high...90 percent.
2. Central Tropical Atlantic (AL99): Showers and thunderstorms associated with a tropical wave located about midway between Africa and the Windward Islands have become less organized overnight. While there is still some chance that a short-lived tropical depression could form during the next day or so, the system is expected to move through a less conducive
environment into Saturday. The wave could reach a slightly more
favorable environment again late this weekend into early next week
as it moves westward at 10 to 15 mph over the central tropical
Atlantic and approaches the Lesser Antilles.
* Formation chance through 48 hours...medium...40 percent.
* Formation chance through 7 days...medium...50 percent.
3. Central Subtropical Atlantic: A small area of low pressure located well southwest of the Azores has weakened overnight, and no development is expected while it drifts northward.
* Formation chance through 48 hours...low...near 0 percent.
* Formation chance through 7 days...low...near 0 percent.
